Benzopyran[4,3-d]-thiazole-derivatives with anti-allergic, anti-anaphylactic and anti-arithritic activity and compositions containing them

Abstract

Compounds of formula ##STR1## (wherein R and R 1 have the meanings reported in the specification) and their preparation are described. The compounds of formula I have anti-allergic, anti-anaphylactic and anti-arthritic activity and are useful in pharmaceutical field. Compositions for pharmaceutical use containing a compound of formula I as active ingredient are described too.

What we claim is: 
     
       1. A compound of formula ##STR10## wherein R represents hydroxy, a hydrogen or a halogen atoms, a C 1  -C 4  alkyl or alkoxy; R 1  represents hydroxy, an OR 2  group or a ##STR11##  group; R 2  represents a C 1  -C 6  alkyl, a benzyl, a group of formula --(CH 2  --CH 2  --O) n  --R 5  wherein n represents an integer from 1 to 4 and R 5  represents a hydrogen atom or a C 1  -C 4  alkyl;   R 3  and R 4 , which are the same or different, represent a hydrogen atom, a C 1  -C 4  alkyl, a benzyl, a phenyl, or R 3  and R 4 , together with the nitrogen atom to which they are bonded, form a 1-piperidinyl, 1-piperazinyl, 4-methyl-1-piperazinyl radical; and salts thereof with pharmaceutically acceptable acids or bases.     
     
     
       2. A compound, according to claim 1, wherein R represents a hydrogen, a chlorine or bromine atom, hydroxy, a methoxy or ethoxy group. 
     
     
       3. A compound according to claim 1, wherein R 1  represents an OR 2  group. 
     
     
       4. A compound according to claim 1, wherein R 1  represents hydroxy and salts thereof with non-toxic organic or inorganic bases suitable for pharmaceutical use. 
     
     
       5. A compound according to claim 1, wherein R 1  represents a ##STR12## group. 
     
     
       6. A compound according to claim 1, wherein R 3  and R 4 , the same or different, represent hydrogen, methyl or ethyl or together with the nitrogen atom to which they are bonded form a 1-piperidinyl, 1-piperazinyl or 4-methyl-1-piperazinyl radical. 
     
     
       7. A pharmaceutical composition for the treatment of allergic and anaphylactic diseases containing a therapeutically effective amount of a compound according to claim 1, with a pharmaceutically acceptable carrier. 
     
     
       8. A pharmaceutical composition for the treatment of arthritis containing a therapeutically effective amount of a compound according to claim 1, with a pharmaceutically acceptable carrier. 
     
     
       9. A method for the treatment of pathological syndromes having an allergic nature consisting in administering a therapeutically effective amount of a compound according to claim 1. 
     
     
       10. A method for the treatment of the syndromes which accompany the arthritic and rheumatic processes consisting in administering a therapeutically effective amount of a compound according to claim 1.